Phonon Coupling's Role in the Non-Equilibrium Dynamics of a Quasicondensate

Cold atoms loaded into cigar shaped traps can realize the Lieb Liniger model where the effective 1-D coupling constant depends both on the three-dimensional scattering length of the atomic species, and on the trap's transverse frequency. By performing a quantum quench of the transverse trapping frequency, non-equilbirum density and phase dynamics can be induced. In the low temperature regime, these dynamics are well characterized by Bogoliubov theory, however at higher temperatures intermode (i.e. phonon-phonon) coupling can become important. In this work we report on classical field simulations of a quasi condensate undergoing the quench protocol outlined above, and comment on the consequences of intermode coupling both for damping, and energy transfer.